Meaning of “wakeful” in the English Dictionary

"wakeful" in British English

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wakefuladjective

uk /ˈweɪk.fəl/ us /ˈweɪk.fəl/ formal

not able to sleep, or used to describe a period of time when you are not able to sleep:

We spent a wakeful night worrying about where he was.
She lay there wakeful the whole night.
wakefulness
noun [ U ] uk /ˈweɪk.fəl.nəs/ us /ˈweɪk.fəl.nəs/

(Definition of “wakeful” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)